Reference for Menachot 160:1

ונתותרו מביא בהן לחם ללחמי תודה ונתותרו אין מביא בהן תודה

and some was left over, he may bring with it the loaves. If [he set money apart] for the loaves of a thank-offering and some was left over, he may not bring with it the thank-offering. What is the reason?

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